add comment about /etc/gshadow, no code changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 17 insertions, 2 deletions

diff --git a/loginutils/addgroup.c b/loginutils/addgroup.c
index e49278efe..215e4a9e0 100644
--- a/loginutils/addgroup.c
+++ b/loginutils/addgroup.c
@@ -79,7 +79,22 @@ static void new_group(char *group, gid_t gid)
         if (ENABLE_FEATURE_CLEAN_UP)
                 free(p);
 #if ENABLE_FEATURE_SHADOWPASSWDS
-        /* Ignore errors: if file is missing we suppose admin doesn't want it */
+        /* /etc/gshadow fields:
+         * 1. Group name.
+         * 2. Encrypted password.
+         *    If set, non-members of the group can join the group
+         *    by typing the password for that group using the newgrp command.
+         *    If the value is of this field ! then no user is allowed
+         *    to access the group using the newgrp command. A value of !!
+         *    is treated the same as a value of ! only it indicates
+         *    that a password has never been set before. If the value is null,
+         *    only group members can log into the group.
+         * 3. Group administrators (comma delimited list).
+         *    Group members listed here can add or remove group members
+         *    using the gpasswd command.
+         * 4. Group members (comma delimited list).
+         */
+        /* Ignore errors: if file is missing we assume admin doesn't want it */
         update_passwd(bb_path_gshadow_file, group, "!::", NULL);
 #endif
 }
diff --git a/loginutils/adduser.c b/loginutils/adduser.c
index 136dcdff8..0e9936ad1 100644
--- a/loginutils/adduser.c
+++ b/loginutils/adduser.c
@@ -177,7 +177,7 @@ int adduser_main(int argc UNUSED_PARAM, char **argv)
          * 5. maximum days password is valid
          * 6. days before password is to expire that user is warned
          * 7. days after password expires that account is disabled
-         * 8. unix date when login expires (may no longer be used)
+         * 8. unix date when login expires (i.e. when it may no longer be used)
          */
         /* fields:     2 3  4 5     6 78 */
         p = xasprintf("!:%u:0:99999:7:::", (unsigned)(time(NULL)) / (24*60*60));